This parts-list page (CARBURETOR (MODEL K3/K4)) contains the most products with one hundred twenty-five listed parts.
To discover exactly which parts you require use the on-line schematic exploded diagram - it will even give you some idea of where and how to fit those new parts.
seventy-two Suzuki DR-Z400 2001 (K1) USA (E03) DRZ400 DR Z400 parts fiche schematic pages.